Fuel-feed device for internal-combustion engines



" Jl lly 2, 1929.

v. HEIDELBERG I 1,719,658

FUEL FEED DEVICE FOR INTERNAL COMBUSTION ENGINES Filed NOV. 23, 1927 O )L O IiiUGBi/ZOZ' ViciorHeidZbe 2:9.

Patented July 2, 1 929.

' UNITED STATES PATENT oFrrcE.

VICTOR HEIDELBERG, OF BENSBERG, NEAR COLOGNE-ON-THE-RHINE, GERMANY, ASSIGNOR '10 MOTORENFABRIK DEUTZ, AKTIENGESEILSCHAIT, OF COLOGNE- DEUTZ, GERMANY.

FUEL-FEED DEVICE FOR INTERNAL-COMBUSTION ENGINES.

Application flledllovember 23, 1927, Serial No. 235,285, and in Germany December 2, 1926.

Devices for alternatively eliminating single fuel pumps of internal combustlon engines by continuous discharging of the pressure space are alread known. These de- 5 vices have the drawbac ,that it is impossible to dismount the fuel pumps during the working of the other'pumps, because the fuel, be ing under pressure in mains, has continuous admission to the interior parts of the pumps. It is undesirable to provide special closmg means in the piping leading to each fuel pump, as it gives the drawback of an undesirable multitude of tubes-and leaking spots. These undesirable drawbacks are avoided according to the invention by placing a rotary slide valve before the suction valves in the pump casing, which valve closesalternatively one or more suction pipes according to its position. The admissionof the fuel to the interior of the eliminated fuel pump or group of fuel pumps is entirely cutoff, that the-dismounting of this pump or these pumps is to be made whilst the engine is running.

In respect to the fuel piping eading to is the only place where leaking could be possible, but this place is easily accessible.

, The drawing shows as an example of the invention a fuel pum for a three-cylinder internal combustion iesel) engine.

Fig. 1 shows a cross section through the pumps,

Fig. 2 shows a of F1 1.

Re erring to the drawings, I have shown a fuel pump block containing a plurality (herein 3) of pump plungers a each provided with a cam actuated roller b. As shown, a fuel supply pipe 0. is connected to a cylindrlcal bore d in the block, with which bore communicates a pluraIi'ty of suction intake conduits e e e leading to the displacement chambers 9 associated with the respective pump plungers. As shown, each suction 1ntake valve is controlled by a suction valve f, pressure valves k associated wit-h said displacement chambers being provided for conpartial section from to B trolling the outlet connections of the latter.

to the fuel injection pipes i.

As shown, in the bore d is placed a rotary shaft m formed integrally with a plurality of rotary valves n n a the latter respectively associated with the suction intake conduits e,, e,, e of the several pump displacethe fuel pump block the rotary slide valve ment chambers g, the valves being so formed that they will be efl'ective in certain positions of rotation of the shaft to interrupt communication between the bore d and the particular intake conduit associated with the valve. Preferably the valves a 12. n, areso disposed relatively to each other that in one position of the saft m all the valves will be in open position, while if the shaft is rotated into different positions one or the other of the valves will be closed. Convenientl the valve shaft m on the end thereof whic projects from the pump block is provided with a handle 0 which may be associated with a suitable pointer for indicating the positions of the cut-off Valves n 71,, 10,, so as to afford the operator visual means for indicating which pump, if any, is rendered inoperatwo.

It will be understood that if desired selective groups of pumps may be rendered inoperative instead of a single pump and that wide deviations may be made from the particular embodiment of the invention herein described without departing from the spirit of the invention.

I claim as an invention 1. A fuel feed device for internal combustion engines comprising, in combination, a plurality of fuel pumps, each provided with means forming a suction intake, a suction valve associated with each intake, a cut-off valve for each intake positioned close to the corresponding suction valve, and a common manually actuated means for selectively closing said cut-off valves.

2. A fuel feed device for internal combustion engines comprising, in combination, a plurality of fuel pumps, each provided with means providing a suction intake, a suction valve associated with each intake, a cut-off valve for each intake positioned close to the corresponding suction valve, a rotary shaft carrying said cut-off valves, said cut-off valves being so disposed on said shaft that rotation thereof will close selected valves in various positions thereof.

3. A fuel feed device for internal combustion engines comprising, in combination, a pluralit of fuel pumps, each provided with means fbrming a suction intake, a suction valve associated with each intake, a cut-off valve for each intake positioned close to the corresponding suction valve, a rotary shaft carrying said cut-off valves, said cutoff valves being so disposed on said shaft that in one position of said shaft all of said valves will be open and selected valves will be closed in various other rotative positions of said shaft.

4. A fuel feed device for internal combustion engines comprising, in combination, a fuel pump casing block having therein a plurality of bores each containing a pump plunger, said block having therein a plurality of fuel intake conduits for said bores, a separate cut-off valve for each of said intakes, and a common manually actuated means for selectively closing said cut-off valves.

5. A fuel feed device for internal combustion engines comprisinmin combination,a fuel pump casing block having therein a plurality of bores each containing a pump plunger, said block having therein a plurality of fuel intake conduits for said bores, a separate cutoff valve for each of said intakes, and a common manually actuated means for selectively closing said cut-off valves, said means in one position thereof being operative to open all said cut-off valves.

6. A fuel feed device for internal combustion engines comprising, in combination, a fuel pump casing block having therein a plurality of bores each containing a pump plunger, separate fuel intake conduits formedin said block for supplying said bores, a common fuel pipe connected to said block for supplying fuel to said conduits, said block having therein manually actuated valve means for selectively interrupting communication between said fuel pipe and said conduits.

DR. VICTOR HEIbELBERG. 

